The AD7401 is a second-generation Sigma-Delta modulator from Analog Devices that converts an analog input signal into a high speed, 1-bit data stream with integrated digital isolation.
The AD7401 is a second‑order sigma‑delta modulator that converts an analog input into a high‑speed 1‑bit data stream. It operates from a 4.5 V–5.25 V supply, provides on‑chip digital isolation, and includes an on‑chip reference. Key features include 16‑bit resolution with no missing codes, low power consumption (20 mA max at 5.25 V), and a wide operating temperature range of –40 °C to +105 °C.
The device is intended for AC motor controls and data acquisition applications. It meets safety and regulatory approvals such as UL 1577 (3750 Vrms isolation), CSA, and VDE certifications. The datasheet provides pin configurations, timing specifications, insulation and safety‑related specifications, and detailed electrical characteristics.
| Resolution | 16 Bits |
|---|---|
| Integral Nonlinearity (INL) | +2 LSB typical |
| Power Consumption | 20 mA max at 5.25 V |
| Input Voltage Range | ±200 mV (±320 mV full scale) |
| Isolation Voltage (UL 1577) | 3750 Vrms for 1 minute |
| Operating Temperature Range | –40 °C to +105 °C |
The AD7401 supports a maximum external clock rate of 20 MHz.
It meets UL 1577 with an isolation voltage of 3750 Vrms for a 1‑minute test.
The device consumes up to 20 mA at a 5.25 V supply.
The differential input range is ±200 mV (±320 mV full scale).